NPPES file of Aug 9, 2026

Stefanie Marie Dieffenbach, WHNP-BC

Women's Health Nurse Practitioner · Portland, OR

Stefanie Marie Dieffenbach, WHNP-BC is a women's health nurse practitioner with a practice address in Portland, Oregon, and NPI 1033965744, issued on Apr 24, 2024. Check the license (Oregon 10025329, as entered in NPPES) with the Oregon board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1033965744
Name
Stefanie Marie Dieffenbach
Credential
WHNP-BC
Primary taxonomy
Women's Health Nurse Practitioner 363LW0102X
License number
10025329 OR
Self-reported in NPPES; status is on the state search
Practice location
545 NE 47TH Ave Ste 102, Portland, OR 97213
Phone
(503) 215-6262
Enumerated
Apr 24, 2024
Record last updated
Apr 24, 2024
Medicare enrollment
Enrolled (PECOS I20240604003861); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest women's health nurse practitioner records → All 133 in Oregon → Look up another NPI →

Also registered at 545 NE 47TH Ave Ste 102

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Gabrielle Alexander, M.DObstetrics & Gynecology Physician1124480413
  2. Stephanie Day, CNMAdvanced Practice Midwife1184202145
  3. Maggie Hayes, MDObstetrics & Gynecology Physician1407232572
  4. Anne Knudsen, MDObstetrics & Gynecology Physician1821006958
  5. Noelle Lefitz, CNMAdvanced Practice Midwife1548362205
  6. Amanda Nambiar, CNM, WHNPAdvanced Practice Midwife1821672395

Verify Stefanie Marie Dieffenbach in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Oregon board licenses this profession
    Search for license 10025329    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Oregon license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Providence Health And Services OregonPortland, OR

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Stefanie Marie Dieffenbach among 133 women's health nurse practitioner records in Oregon

Stefanie Marie Dieffenbach, WHNP-BC is one of 133 women's health nurse practitioner records with a practice address in Oregon. 47% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2024, is newer than 95% of them.

  • NPI issued2024 · 95% of these records are older, 2% newer
  • In a Medicare fileYes · 47% of these records are
  • In the CMS Doctors and Clinicians fileYes · 35% of these records are
  • Graduated2023 · median 2015 among the 46 with a school on file
  • Record last updated2024 · 68% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LW0102X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Women's Health Nurse Practitioner providers in Oregon

There are 133 women's health nurse practitioner records in Oregon.

All 133 in Oregon → Every provider in Portland → Women's Health Nurse Practitioner nationwide →

The 8 women's health nurse practitioner records with the nearest ZIP codes

  1. Margaret Jansa, WHCNPPortland, OR 972131295380723
  2. Linda Anzalone, WHNPPortland, OR 972141194274274
  3. Christina Steurer, N.P., R.N.Portland, OR 972121669704573
  4. Jo Thompson, NPPortland, OR 972121417312646
  5. Lindsey Wismer, NPPortland, OR 972121871898544
  6. Kimberly Shotz, WHCNP, LACPortland, OR 972151003908120
  7. Sheryl Horwitz, WHCNPPortland, OR 972101043303902
  8. Evonne Kandas, N.P.Portland, OR 972101689677445

Common questions

What is Stefanie Marie Dieffenbach, WHNP-BC's NPI number?

Stefanie Marie Dieffenbach, WHNP-BC's National Provider Identifier (NPI) is 1033965744, issued on Apr 24, 2024. An NPI identifies a provider in billing; it is not a license.

Where is Stefanie Marie Dieffenbach, WHNP-BC located?

The NPPES record lists a practice address at 545 NE 47TH Ave Ste 102, Portland, OR, 97213. Phone: (503) 215-6262. Providers update this record themselves, so call before visiting.

How can I verify Stefanie Marie Dieffenbach, WHNP-BC's license?

NPPES lists Oregon license number 10025329, as entered by the provider. Search the Oregon board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.